B-door

"B" door camera forward in the direction of super automatic, it sounds a little raw! this is an entirely controlled by the photographer, the exposure is also a personal creation process. "B" door B "in the dictionary is Bulb, refers to the past that ball by hand operation of pneumatic shutter release, or in Flash using the Flash exposure. However, the "door" B camera forward in the direction of super automatic, it sounds a little raw! this is an entirely controlled by the photographer, the exposure is also a personal creation process. "B" door B "in the dictionary is Bulb, refers to the past that ball by hand operation of pneumatic shutter release, or in Flash using the Flash exposure. However, a little creative photographer who believes that "B" is virtually Boundless (no limit). "B-door" and other shutter speed is not the same, the photographer can use it in any 1-second time control shutter switches to walk into a fantasy world. When you enter the field of "Brl", you can see outside the traditional photos, for example the singularity sky stars orbit, Rainbow-like light and shadow, no one in the street and take the bright sky ... 　　Use the B Gates photography of the basic requirements, is a frame with a B doors can make the shutter open for long time exposure of the camera, a more solid tripod and a manual shutter line. Shooting, it is best to have a super sensitivity of handheld light meter, because many of the camera's built-in light meter can shoot on possible dark scenes accurately measured the amount of light. On the B Gates photography experienced photographers, often recommended when shooting for classifying exposure as much as possible, because this will make the effect more changes. They also acknowledged that although most successful Brl exposure often comes from the inspiration of speculation, but a more sensitive light meter to at least be able to provide a basis for classification of exposure. Good shooting night of photographers who pointed out that, at the end of the B gates used long time exposure, the camera jitter, one of the best way is to release the shutter, the lens cap on the lens cap. Is there a better way is to use a piece of black cardboard, before the lens in place of the normal lens cap. This approach also has the advantage that you can change the focus during the exposure or aperture. If tuneup, occasionally make camera jitter occurs, before continuing with the exposure, you have to determine if the camera has stopped jitter, this is ideal for using longer focal length lens on particularly important. Use B doors for long time exposure, prone to problem is photographers often say the so-called "reciprocity law failure". This situation usually use color film exposure to one second longer. Essentially, long exposure to the film's color balance changes, but the phenomenon of emergence, photographers are often very difficult to predict. In General, there is no simple way to solve the reciprocity law invalidated, so that each image can get accurate exposure. United Kingdom photographer David · Williams made a simple approach, that is, "in a calculated on the basis of the exposure, use a longer exposure time more shoot several sheets". Williams noted that for a long time exposure on, each photo must be on the exposure time and aperture for record. In addition you can also use various exposure index for discussion, to make up for the reciprocal laws fail due to insufficient. One way is to increase the total exposure, for 1-9 seconds of exposure increase 1/2 a l-class aperture; for 10-99-second exposure increased by 1-2-aperture; exposure 100 seconds over increased 2-3-aperture. Similar index is generally speaking, you cannot use it as is the same thing, especially when using different film, as the case may be. In short, it is necessary to solve the problem of reciprocity law failure, mainly rely on the test, and the contents of the records and the results of the comparison, and gradually repeatedly in practice some experience to exploration.